I had a 33 and could not stand it
i upgraded to a 40b used cuz it was there and the price was right.
i like the footprint,
i think your 50 is probably 21 high as my 40b has the same dimensions as that 50.
i have a 6 bulb t5ho and my sps are growing ok, not great but I'm still new at it. I don't think a 4 bulb would really work for sps in the long term, but why not get the tank you want and upgrade the lighting when you can afford too.
If I had to stay with a 36 tank i personally would go with 36x24 or 36x36 18-20 inches high.... perhaps 20high rimless only filled to 18 and upgrade the lights but i like the deep look of that kind of tank.
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